1 /*
2  * Copyright 2021 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package androidx.window.area
18 
19 import android.app.Activity
20 import android.os.Binder
21 import androidx.window.core.ExperimentalWindowApi
22 import java.util.concurrent.Executor
23 import kotlinx.coroutines.flow.Flow
24 import kotlinx.coroutines.flow.flowOf
25 
26 /** Empty Implementation for devices that do not support the [WindowAreaController] functionality */
27 @ExperimentalWindowApi
28 internal class EmptyWindowAreaControllerImpl : WindowAreaController() {
29 
30     override val windowAreaInfos: Flow<List<WindowAreaInfo>>
31         get() = flowOf(listOf())
32 
transferActivityToWindowAreanull33     override fun transferActivityToWindowArea(
34         token: Binder,
35         activity: Activity,
36         executor: Executor,
37         windowAreaSessionCallback: WindowAreaSessionCallback
38     ) {
39         windowAreaSessionCallback.onSessionEnded(IllegalStateException("There are no WindowAreas"))
40     }
41 
presentContentOnWindowAreanull42     override fun presentContentOnWindowArea(
43         token: Binder,
44         activity: Activity,
45         executor: Executor,
46         windowAreaPresentationSessionCallback: WindowAreaPresentationSessionCallback
47     ) {
48         windowAreaPresentationSessionCallback.onSessionEnded(
49             IllegalStateException("There are no WindowAreas")
50         )
51     }
52 }
53